Fix flaky "t0021.15 required process filter should filter data" #241
Description
This test case seems to fail infrequently, most often in the linux-gcc job. See e.g. https://dev.azure.com/gitgitgadget/git/_build/results?buildId=9226&view=ms.vss-test-web.build-test-results-tab&runId=19716&resultId=100893&paneView=debug
Reactions are currently unavailable